WO2022135124A1 - 用于发声装置的振动板及发声装置 - Google Patents

用于发声装置的振动板及发声装置 Download PDF

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Publication number
WO2022135124A1
WO2022135124A1 PCT/CN2021/135706 CN2021135706W WO2022135124A1 WO 2022135124 A1 WO2022135124 A1 WO 2022135124A1 CN 2021135706 W CN2021135706 W CN 2021135706W WO 2022135124 A1 WO2022135124 A1 WO 2022135124A1
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vibration plate
aramid film
vibration
aramid
layer
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PCT/CN2021/135706
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English (en)
French (fr)
Inventor
李美玲
刘慧慧
凌风光
李春
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歌尔股份有限公司
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Publication of WO2022135124A1 publication Critical patent/WO2022135124A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details

Definitions

  • the application belongs to the technical field of electronic products, and in particular, the application relates to a vibrating plate and a sounding device for a sounding device.
  • a loudspeaker usually includes a vibration system and a magnetic circuit system.
  • the vibration system includes a diaphragm and a voice coil that are combined together.
  • a vibration plate is usually fixed at the center of the diaphragm to enhance the The rigidity of the center of the diaphragm.
  • Common vibration plates are generally made of plastic or rubber and other polymers to be hot pressed into a convex hull structure.
  • traditional vibration plates are made from PET (polyethylene terephthalate) vibration plates, PEN (polyethylene naphthalate) Alcohol ester) vibration plate is gradually replaced by LCP (Liquid Crystal Polymer, liquid crystal polymer) vibration plate, LCP vibration plate has a higher modulus than PET vibration plate, which can improve the high-frequency sound of the sound device to a certain extent. performance.
  • the ratio of the longitudinal modulus to the transverse modulus of the LCP material reaches 1.5-2.5, resulting in slight deformation of the LCP vibration plate during molding, and during the high-frequency vibration of the diaphragm, due to The anisotropy of the LCP vibration plate may lead to polarization of the vibration plate, which affects the high-frequency sound quality and service life of the speaker.
  • An object of the embodiments of the present application is to provide a vibration plate for a sound-generating device and a new technical solution for the sound-generating device.
  • a vibration plate for a sound generating device comprising an aramid film
  • the vibration plate is a single-layer vibration plate, and the single-layer vibration plate is made of the aramid film;
  • the vibration plate is a composite vibration plate
  • the composite vibration plate includes at least two layers
  • at least one layer of the composite vibration plate includes the aramid film.
  • the bending strength of the aramid film is greater than or equal to 200MPa.
  • the modulus of the aramid film is greater than or equal to 8 GPa.
  • the forming raw material of the aramid film includes at least one of para-aramid, meta-aramid and heterocyclic aromatic polyamide.
  • the forming manner of the aramid film is one of extrusion molding, injection molding and tape casting.
  • the vibrating plate is made by a hot pressing forming process, and the forming temperature of the vibrating plate is greater than 140°C.
  • the thickness of the vibration plate ranges from 4 ⁇ m to 500 ⁇ m.
  • the vibration plate includes two outer layers and an intermediate layer arranged between the two outer layers, the outer layer is made of the aramid film, and the intermediate layer is a foam material layer. .
  • a sound generating device including a vibration system and a magnetic circuit system cooperating with the vibration system, the vibration system including the vibration plate of the first aspect.
  • An embodiment of the present application provides a vibration plate for a sound-generating device, comprising an aramid film, and when the vibration plate is a single-layer vibration plate, the single-layer vibration plate is made of the aramid film; or , when the vibration plate is a composite vibration plate, the composite vibration plate includes at least two layers, and at least one layer of the composite vibration plate includes the aramid film.
  • the vibrating plate provided by the embodiment of the present application adopts the aramid film at least in part, and the high strength of the aramid film can reduce the thickness of the vibrating plate on the basis of ensuring the structural stability of the aramid film The size increases the mid- and high-frequency sensitivity of the sound-generating device with the vibrating plate.
  • FIG. 1 is a schematic structural diagram of a vibrating plate for a sounding device provided by an embodiment of the application;
  • Fig. 2 is the infrared spectrum of the para-aramid fiber raw material of a kind of vibrating plate provided by the embodiment of the application;
  • Fig. 3 is a kind of vibrating plate provided by the embodiment of the application and a conventional vibrating plate FR curve comparison diagram of the sound generating device;
  • FIG. 4 is a comparison diagram of the THD test curve of a sounding device with a vibrating plate provided by an embodiment of the present application and a conventional vibrating plate;
  • FIG. 5 is a graph comparing the bending resistance curves of a vibrating plate provided by an embodiment of the present application and a conventional vibrating plate under different thicknesses.
  • an embodiment of the present application provides a vibrating plate for a sound generating device, including an aramid film 1 .
  • the vibrating plate can be a single-layer vibrating plate or a composite vibrating plate with multiple layers stacked, and when the vibrating plate is a single-layer vibrating plate, the single-layer vibrating plate is made of the aramid film 1; or , when the vibration plate is a composite vibration plate, the composite vibration plate includes at least two layers, and at least one layer of the composite vibration plate includes the aramid film 1, that is, the at least two layers of the In the composite vibration plate, each layer may be made of the aramid film 1 , or some of the layers may be made of the aramid film 1 , and the remaining layers may be made of the foam material 2 .
  • the thickness of the aramid film 1 ranges from 4 ⁇ m to 100 ⁇ m, preferably, the thickness of the aramid film 1 ranges from 10 ⁇ m to 50 ⁇ m.
  • the vibration plate includes two outer layers and an intermediate layer disposed between the two outer layers, the outer layer is made of the aramid film 1, and the intermediate layer is The foamed material layer, ie the intermediate layer, is made of the foamed material 2 . Due to the high structural strength of the two outer layers, the structural stability of the vibrating plate can be ensured, and the foamed material layer, as an intermediate layer, can be reduced by the low density of the foamed material 2. The weight of the vibration plate is beneficial to the lightweight of the vibration plate.
  • Xm and Yn are the groups used to replace hydrogen on the benzene ring of the para-aramid fiber, and specifically can be groups such as methyl and ethyl.
  • the foaming material 2 can be a foaming material such as PMI (polymethacrylimide) foam, PET (polyethylene terephthalate) foam, etc.
  • the foaming material 2 is made of Part of the composite vibration plate can be bonded with the aramid film 1; in addition, the foam material 2 can also be a foam film, such as EVA (ethylene-vinyl acetate copolymer) foam film, TPU (thermoplastic polyurethane elastomer rubber) foam film or PA (polyamide, commonly known as nylon) foam film, the foam film can be directly attached to the surface of the aramid film 1 to form the composite vibration plate .
  • EVA ethylene-vinyl acetate copolymer
  • TPU thermoplastic polyurethane elastomer rubber
  • PA polyamide, commonly known as nylon
  • the structural strength and dimensional stability of the composite vibration plate can be improved , and reduce the moisture absorption rate of the composite vibration plate.
  • the aramid film 1 provided in the embodiments of the present application has better thickness uniformity after film formation, so that the aramid film 1 has The advantages of isotropy and better stability avoid the process of pre-impregnation and multi-layer compounding of aramid fibers.
  • a single layer of the aramid film 1 can realize the stable molding of the vibrating plate, reduce the weight of the vibrating plate, save the vibration space of the sound-emitting device with the vibrating plate, and improve the vibrating plate with the vibrating plate.
  • the mid- and high-frequency sensitivity of the sound-generating device is compared with traditional aramid fibers.
  • the vibrating plate provided in the embodiment of the present application adopts the aramid film 1 at least in part, and the high strength of the aramid film 1 can reduce the aramid film 1 on the basis of ensuring the structural stability of the aramid film 1
  • the thickness dimension of the fiber film 1 improves the mid- and high-frequency sensitivity of the sound-emitting device with the vibrating plate.
  • the bending strength of the aramid film 1 is greater than or equal to 200MPa.
  • the aramid film 1 since the aramid film 1 has good bending strength, the vibration plate is not easily deformed when it vibrates at medium and high frequencies, and the FR (frequency response) curve of the sounding device with the vibration plate is smoother, On the basis of ensuring the structural strength and service life of the sounding device, the sensitivity and sounding effect of the sounding device are improved.
  • the bending strength of the aramid film 1 can be made into an aramid film sample under the condition of 23° C. according to the bending strength test standard, and then the bending strength of the aramid film sample is tested.
  • FIG. 3 shows a comparison diagram of the FR curve of the sound generating device with the vibration plate provided by the embodiment of the application and the vibration plate of traditional materials, wherein the vibration plate provided by the embodiment of the application is a single-layer aromatic
  • the thin film vibration plate is in the shape of a convex hull and has a thickness of 50 ⁇ m.
  • the traditional vibration plate is made of LCP (Liquid Crystal Polymer, liquid crystal polymer), which is in the shape of a convex hull and has a thickness of 50 ⁇ m.
  • LCP Liquid Crystal Polymer, liquid crystal polymer
  • the modulus of the aramid film 1 is greater than or equal to 8GPa, and the modulus may be an elastic modulus, specifically including a flexural modulus, a compression modulus and a shear modulus.
  • the specific modulus is greater than or equal to 5.7 GPa/(g/cm 3 ).
  • the modulus of general plastic or rubber is about 1GPa-2GPa, which is not enough to meet the vibration requirements of the vibration plate.
  • the aramid film 1 has a high modulus, which can reach 8GPa or even higher, so that the vibration plate obtained by using the aramid film 1 has a high elastic modulus.
  • the modulus of the vibrating plate increases, the acoustic high-frequency resonance peak of the sound-generating device installed with the vibrating plate is delayed, so that the flatness and frequency loudness of the frequency-response curve of the sound-generating device are increased, and the sound-generating device can be A higher high-frequency sound quality is obtained, which further verifies that the vibration plate provided by the embodiment of the present application in FIG. 3 can improve the sound quality of the sound generator.
  • FIG. 5 shows a graph of the flexural resistance curves of a vibrating plate provided by the embodiment of the present application and a conventional vibrating plate under different thicknesses.
  • the flexural resistance of the vibrating plate and its elastic modulus The relationship between volume and thickness is as follows:
  • the vibration plate provided by the embodiment of the present application is a single-layer aramid film vibration plate, which is in the shape of a flat plate, and the thickness of the single-layer aramid film vibration plate varies from 2.5 ⁇ m to 10 ⁇ m.
  • Ethylene terephthalate) vibration plate and PI (polyimide) vibration plate both in flat shape, the thickness of PET varies from 2.5 ⁇ m to 12.5 ⁇ m, and the thickness of PI vibration plate varies from 9 ⁇ m to 12.5 ⁇ m. ⁇ m, and is based on the bending resistance of a 12.5 ⁇ m thick PI diaphragm. It can be seen from FIG.
  • the bending resistance of the single-layer aramid film vibrating plate provided by the embodiment of the present application is significantly higher than that of the traditional PET vibrating plate and the PI vibrating plate of the same thickness, so that the vibrating plate provided in the embodiment of the present application has the same thickness.
  • the sound device has good sound quality.
  • the molding method of the aramid film 1 is one of extrusion molding, injection molding and tape casting.
  • the molding of the aramid film 1 can specifically be performed by heating and melting at least one molding raw material in p-aramid, meta-aramid and heterocyclic aromatic polyamide, and extruding and injecting the melted molding raw material. Or cast, to obtain the aramid film 1 with a certain thickness dimension.
  • the aramid film 1 has good temperature resistance, the aramid film 1 can be subjected to a hot-press molding process during the extrusion molding process, specifically, the molding temperature is controlled to be greater than or equal to 140° C. range to ensure the molding size and molding efficiency of the aramid film 1.
  • the vibration plate is a flat plate structure or a convex hull structure.
  • the vibration plate of the flat plate structure can be directly formed, or the vibration plate can be formed by being stacked with the foam material 2 of the layered structure.
  • the vibration plate can be set as a convex hull structure. Because the film-forming thickness uniformity of the aramid film 1 is good, the aramid film 1 has the advantages of isotropy and better stability, and ensures the structural stability of the vibration plate with the convex hull structure.
  • FIG. 4 is a THD (harmonic distortion) test curve of a sound-generating device with a vibrating plate provided by an embodiment of the present application and a conventional vibrating plate, wherein the vibrating plate provided in an embodiment of the present application is a single
  • the layered aramid film vibration plate has a convex hull shape and a thickness of 50 ⁇ m.
  • the traditional vibration plate is made of LCP (Liquid Crystal Polymer, liquid crystal polymer), which has a convex hull shape and a thickness of 50 ⁇ m. As can be seen from FIG.
  • the sound-generating device with the vibrating plate of the embodiment of the present application has lower THD (harmonic distortion) than the sound-generating device with the conventional LCP vibrating plate, which shows that the vibrating plate provided by the embodiment of the present application It has better anti-polarization ability, and makes the sound quality of the sound producing device with the vibration plate better.
  • the thickness of the vibration plate is in the range of 4 ⁇ m-500 ⁇ m, preferably, the thickness of the vibration plate is in the range of 20 ⁇ m-300 ⁇ m.
  • the thickness of the vibrating plate is too low, the modulus and structural strength of the vibrating plate are low, and the structure will be damaged during the vibration process; and when the thickness of the vibrating plate is too high, although all the The modulus and structural strength of the vibrating plate are sufficiently large, but the excessive weight of the vibrating plate will affect the sound-producing sensitivity of the sound-generating device, thereby affecting the sound-generating effect of the sound-generating device. Therefore, when the thickness of the vibrating plate is controlled within the range of 4 ⁇ m-500 ⁇ m, the structural strength and vibration sensitivity of the vibrating plate can be taken into consideration, so as to ensure the sound producing effect of the sound producing device.
  • An embodiment of the present application further provides a sound-generating device, including a vibration system and a magnetic circuit system cooperating with the vibration system, and the vibration system includes the vibration plate.
  • the sound-generating device may be a sound-generating device such as a speaker or a receiver, and at least part of the vibrating plate is made of the aramid film 1, which enhances the modulus and structural strength of the vibrating plate, so that the sound-generating The device has a wider frequency response range and lower distortion, which improves the sound producing effect of the sound producing device.
  • the vibration system includes an annular diaphragm, a hollow area is formed in the middle of the annular diaphragm, and the vibration plate is connected to the hollow area of the annular diaphragm.

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  • Acoustics & Sound (AREA)
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Abstract

本申请实施例提供了一种用于发声装置的振动板及发声装置，所述振动板包括芳纶薄膜，所述振动板为单层振动板的情况下，所述单层振动板采用所述芳纶薄膜制成；或者，所述振动板为复合振动板的情况下，所述复合振动板包括至少两层，所述的复合振动板中的至少一层包括所述芳纶薄膜。本申请实施例提供的所述振动板至少部分采用所述芳纶薄膜，所述芳纶薄膜的高强度可以在保证所述芳纶薄膜结构稳定性的基础上，减小所述芳纶薄膜的厚度尺寸，提升具有所述振动板的发声装置的中高频灵敏度。

Description

用于发声装置的振动板及发声装置 技术领域
本申请属于电子产品技术领域，具体地，本申请涉及一种用于发声装置的振动板及发声装置。
背景技术
扬声器是便携式电子设备中一种重要的声学部件，用于将声波电信号转换成声音信号并对外发声。扬声器通常包括振动系统和磁路系统，振动系统包括结合在一起的振膜和音圈，为了减小扬声器的失真和提高扬声器的灵敏度，通常会在振膜的中心位置固定一块振动板，用以增强振膜中心部位的刚性。
常见的振动板一般采用塑料或者橡胶等高分子聚合物热压成凸包结构，比如传统的振动板从PET(聚对苯二甲酸乙二醇酯)振动板、PEN(聚萘二甲酸乙二醇酯)振动板逐渐替换为LCP(Liquid Crystal Polymer，液晶高分子聚合物)振动板，LCP振动板相对于PET振动板具有较高的模量，可以在一定程度上提高发声装置的高频发声性能。但由于LCP材料具有取向性，LCP材料的纵向模量和横向模量的比值达到了1.5-2.5，导致LCP振动板在成型时会出现轻微变形，而且在振膜高频振动的过程中，由于LCP振动板的各向异性，可能会导致振动板产生偏振，影响扬声器的高频发音品质和使用寿命。
发明内容
本申请实施例的一个目的是提供一种用于发声装置的振动板及发声装置的新技术方案。
根据本申请实施例的第一方面，提供了一种用于发声装置的振动板，包括芳纶薄膜；
所述振动板为单层振动板，所述单层振动板采用所述芳纶薄膜制成；
或者，所述振动板为复合振动板，所述复合振动板包括至少两层，所述的复合振动板中的至少一层包括所述芳纶薄膜。
可选地，所述芳纶薄膜的厚度范围为4μm-100μm。
可选地，所述芳纶薄膜的弯曲强度大于或等于200MPa。
可选地，所述芳纶薄膜的模量大于或等于8GPa。
可选地，所述芳纶薄膜的成型原料包括对位芳纶、间位芳纶和杂环芳香族聚酰胺中的至少一种。
可选地，所述芳纶薄膜的成型方式为挤压成型、注塑成型和流延成型中的一种。
可选地，所述振动板为平板结构或凸包结构。
可选地，所述振动板采用热压成型工艺制成，所述振动板的成型温度大于140℃。
可选地，所述振动板的厚度范围为4μm-500μm。
可选地，所述振动板包括两层外表层和设在两个所述外表层之间的中间层，所述外表层由所述芳纶薄膜制成，所述中间层为发泡材料层。
根据本申请实施例的第二方面，提供了一种发声装置，包括振动系统和与所述振动系统相互配合的磁路系统，所述振动系统包括第一方面所述的振动板。
本申请实施例的一个技术效果在于：
本申请实施例提供了一种用于发声装置的振动板，包括芳纶薄膜，所述振动板为单层振动板的情况下，所述单层振动板采用所述芳纶薄膜制成；或者，所述振动板为复合振动板的情况下，所述复合振动板包括至少两层，所述的复合振动板中的至少一层包括所述芳纶薄膜。本申请实施例提供的所述振动板至少部分采用所述芳纶薄膜，所述芳纶薄膜的高强度可以在保证所述芳纶薄膜结构稳定性的基础上，减小所述振动板的厚度尺寸，提升具有所述振动板的发声装置的中高频灵敏度。
通过以下参照附图对本申请的示例性实施例的详细描述，本申请的其它特征及其优点将会变得清楚。
附图说明
被结合在说明书中并构成说明书的一部分的附图示出了本申请的实施例，并且连同其说明一起用于解释本申请的原理。
图1为本申请实施例提供的一种用于发声装置的振动板的结构示意图；
图2为本申请实施例提供的一种振动板的对位芳纶原料的红外图谱；
图3为具有本申请实施例提供的一种振动板和常规振动板的发声装置FR曲线对比图；
图4为具有本申请实施例提供的一种振动板与常规振动板的发声装置THD测试曲线对比图；
图5为具有本申请实施例提供的一种振动板与常规振动板在不同厚度情况下的抗弯性能曲线对比图。
其中：1-芳纶薄膜；2-发泡材料。
具体实施方式
现在将参照附图来详细描述本申请的各种示例性实施例。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本申请的范围。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本申请及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为说明书的一部分。
在这里示出和讨论的所有例子中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它例子可以具有不同的值。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一 旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
参照图1，本申请实施例提供了一种用于发声装置的振动板，包括芳纶薄膜1。
所述振动板可以为单层振动板或者多层层叠设置的复合振动板，所述振动板为单层振动板的情况下，所述单层振动板采用所述芳纶薄膜1制成；或者，所述振动板为复合振动板的情况下，所述复合振动板包括至少两层，所述的复合振动板中的至少一层包括所述芳纶薄膜1，也就是至少两层的所述复合振动板中可以每层均采用所述芳纶薄膜1制成，也可以其中部分层采用所述芳纶薄膜1制成，剩余层采用发泡材料2制成。
所述芳纶薄膜1的厚度范围为4μm-100μm，优选地，所述芳纶薄膜1的厚度范围为10μm-50μm。
具体地，参见图1，所述振动板包括两层外表层和设在两个所述外表层之间的中间层，所述外表层由所述芳纶薄膜1制成，所述中间层为发泡材料层，也就是所述中间层由所述发泡材料2制成。由于两个所述外表层的结构强度较高，可以保证所述振动板的结构稳定性，而所述发泡材料层作为中间层，可以借助所述发泡材料2的低密度来减小所述振动板的重量，有利于所述振动板的轻量化。
具体地，所述芳纶薄膜1可以由芳纶树脂或改性芳纶聚合物制成，比如所述芳纶薄膜1的成型原料可以包括对位芳纶和间位芳纶等芳纶树脂以及杂环芳香族聚酰胺等改性芳纶聚合物中的至少一种，以对位芳纶为例，对位芳纶的分子通式如下：
Figure PCTCN2021135706-appb-000001
其中，Xm和Yn为对位芳纶的苯环上用于取代氢的基团，具体可以是甲基、乙基等基团。
具体地，对位芳纶结构的红外图谱如图2所示，从图2中可以看出，对位芳纶结构的红外图谱在3268cm -1处出现了N-H伸缩振动吸收峰，在1599cm -1和1498cm -1处出现了碳骨架的伸缩振动峰，在1651cm -1处出现了C＝O的伸缩振动峰，验证了对位芳纶中存在酰胺键；同时，在1498cm -1处有苯环的骨架吸收峰，在690cm -1处有苯环上的C-H平面外弯曲的强吸收峰，在2900cm -1附近有不饱和碳氢键的吸收峰，验证了对位芳纶中存在苯环结构。
具体地，所述发泡材料2可以是PMI(聚甲基丙烯酰亚胺)泡沫、PET(聚对苯二甲酸乙二醇酯)泡沫等发泡材料，所述发泡材料2制成所述复合振动板的部分层后可以与所述芳纶薄膜1粘接；另外，所述发泡材料2也可以发泡胶膜，比如EVA(乙烯-乙酸乙烯共聚物)发泡胶膜、TPU(热塑性聚氨酯弹性体橡胶)发泡胶膜或PA(聚酰胺,俗称尼龙)发泡胶膜，所述发泡胶膜可以直接贴合在所述芳纶薄膜1的表面形成所述复合振动板。由于所述芳纶薄膜1具有较高的模量和刚性，并且通过Xm和Yn置换所述芳纶薄膜1主链苯环上的氢，可以提高所述复合振动板的结构强度和尺寸稳定性，并降低所述复合振动板的吸湿率。
而且，所述芳纶薄膜1的高强度可以在保证所述芳纶薄膜1结构稳定性的基础上，有效控制了所述芳纶薄膜1的厚度尺寸，也就是降低了述芳纶薄膜1重量，使得所述振动板具有较高的模量和较低的重量，提升了具有所述振动板的发声装置的中高频灵敏度。另外，所述芳纶薄膜1具有较高的内阻尼，使得具有所述振动板的发声装置的失真更小，听感更清晰、明快。而所述芳纶薄膜1的厚度过小时，所述芳纶薄膜1的强度较弱，无法承受频繁的振动；所述芳纶薄膜1的厚度过大时，所述芳纶薄膜1的重量也就增加，较重的质量会影响具有所述振动板的发声装置的中高频灵敏度。
更重要的是，本申请实施例提供的所述芳纶薄膜1相比较于传统的芳纶纤维，所述芳纶薄膜1在成膜后的厚度均匀性好，使得所述芳纶薄膜1具有各向同性的优点和更好的稳定性，避免了芳纶纤维的预浸及多层复合的工艺过程。单层所述芳纶薄膜1便可以实现所述振动板的稳定成型，而 且降低了所述振动板的重量，节省了具有所述振动板的发声装置的振动空间，提升了具有所述振动板的发声装置的中高频灵敏度。
本申请实施例提供的所述振动板至少部分采用所述芳纶薄膜1，所述芳纶薄膜1的高强度可以在保证所述芳纶薄膜1结构稳定性的基础上，减小所述芳纶薄膜1的厚度尺寸，提升具有所述振动板的发声装置的中高频灵敏度。
可选地，所述芳纶薄膜1的弯曲强度大于或等于200MPa。
具体地，由于所述芳纶薄膜1具有较好的弯曲强度，使得所述振动板在中高频振动时不易产生弯曲变形，具有所述振动板的发声装置的FR(频响)曲线更加平滑，在保证了该发声装置的结构强度和使用寿命的基础上，提高了该发声装置的灵敏度和发声效果。另外，所述芳纶薄膜1的弯曲强度可以在23℃条件下以弯曲强度的测试标准制成芳纶薄膜试样，然后对芳纶薄膜试样的弯曲强度进行测试。
在一种具体的实施方式中，图3给出了具有本申请实施例提供的振动板和传统材质的振动板的发声装置FR曲线对比图，其中本申请实施例提供的振动板为单层芳纶薄膜振动板，呈凸包状，厚度为50μm，传统的振动板采用LCP(Liquid Crystal Polymer，液晶高分子聚合物)制成，呈凸包状，厚度为50μm。从图3中可以看出，具有本申请实施例提供的振动板的发声装置FR曲线更加平滑，也就是具有本申请实施例提供的振动板的发声装置具有良好的高频发声品质。
可选地，所述芳纶薄膜1的模量大于或等于8GPa，所述模量可以为弹性模量，具体包括弯曲模量、压缩模量和剪切模量，所述芳纶薄膜1的比模量大于或等于5.7GPa/(g/cm 3)。
具体地，一般塑料或者橡胶的模量大概在1GPa-2GPa，不足以满足振动板的振动要求。而所述芳纶薄膜1具有很高的模量，可以达到8GPa甚至更高，使得采用所述芳纶薄膜1获得的振动板具有很高的弹性模量。所述振动板的模量在增加的同时，安装有该振动板的发声装置的声学高频谐振峰会发生后延，使得该发声装置的频响度曲线平坦度和频响度增大，该发声装置可以获得较高的高频发声品质，进一步验证了图3中本申请实施例 提供的振动板可以提高发声装置的发声品质。
在一种具体的实施方式中,图5给出了本申请实施例提供的一种振动板与常规振动板在不同厚度情况下的抗弯性能曲线对比图，振动板的抗弯性能与其弹性模量和厚度的关系如下：
抗弯性能＝弹性模量*厚度
图5中，本申请实施例提供的振动板为单层芳纶薄膜振动板，呈平板状，单层芳纶薄膜振动板的厚度变化具体从2.5μm至10μm，传统的振动板包括PET(聚对苯二甲酸乙二醇酯)振动板和PI(聚酰亚胺)振动板，均呈平板状，PET的厚度变化具体从2.5μm至12.5μm，PI振动板的厚度变化具体从9μm至12.5μm，并且以12.5μm厚的PI振动板的抗弯性能为基准。从图5中可以看出，本申请实施例提供的单层芳纶薄膜振动板的抗弯性能明显高于同等厚度的传统PET振动板和PI振动板，使得具有本申请实施例提供的振动板的发声装置具有良好的发声品质。
可选地，所述芳纶薄膜1的成型方式为挤压成型、注塑成型和流延成型中的一种。
所述芳纶薄膜1的成型具体可以通过将对位芳纶、间位芳纶和杂环芳香族聚酰胺中的至少一种成型原料进行加热融化，将融化后的成型原料进行挤压、注塑或者流延，以获得具有一定厚度尺寸的所述芳纶薄膜1。
另外，由于所述芳纶薄膜1具有很好的耐温性，所述芳纶薄膜1在挤压成型的过程中，可以采用热压成型工艺，具体为将成型温度控制在大于或者等于140℃的范围，以保证所述芳纶薄膜1的成型尺寸和成型效率。
可选地，所述振动板为平板结构或凸包结构。
具体地，所述芳纶薄膜1在成膜后，可以直接形成平板结构的所述振动板，或者与层状结构的所述发泡材料2层叠设置后形成所述振动板。而为了提高具有所述振动板的发声装置的发声强度和发声指向性，可以将所述振动板设置为凸包结构。由于所述芳纶薄膜1的成膜厚度均匀性好，使得所述芳纶薄膜1具有各向同性的优点和更好的稳定性，保证了凸包结构所述振动板的结构稳定性。
在一种具体的实施方式中，图4为具有本申请的一个实施例提供的振 动板与常规振动板的发声装置THD(谐波失真)测试曲线，其中本申请实施例提供的振动板为单层芳纶薄膜振动板，呈凸包状，厚度为50μm，传统的振动板采用LCP(Liquid Crystal Polymer，液晶高分子聚合物)制成，呈凸包状，厚度为50μm。从图4可以看出，安装本申请实施例振动板的发声装置相对于安装常规的LCP振动板的发声装置具有更低的THD(谐波失真)，这表明，本申请实施例提供的振动板具有更优的抗偏振能力，并且使得具有所述振动板的发声装置的音质更佳。
可选地，所述振动板的厚度范围为4μm-500μm，优选地，所述振动板的厚度范围为20μm-300μm。
具体地，所述振动板的厚度过低时，所述振动板的模量和结构强度较低，在振动过程中会出现结构破坏的情况；而所述振动板的厚度过高时，虽然所述振动板的模量和结构强度足够大，但是振动板的重量过大会影响发声装置的发声灵敏度，从而会影响发声装置的发声效果。所以，将所述振动板的厚度控制在4μm-500μm的范围内时，可以兼顾所述振动板的结构强度和振动灵敏性，保证发声装置的发声效果。
本申请实施例还提供了一种发声装置，包括振动系统和与所述振动系统相互配合的磁路系统，所述振动系统包括所述的振动板。
具体地，所述发声装置可以是扬声器或者受话器等发声装置，所述振动板的至少部分采用所述芳纶薄膜1制成，增强了所述振动板的模量和结构强度，使得所述发声装置具有较宽的频响范围和较低的失真，提高了所述发声装置的发声效果。
可选地，所述振动系统包括环形振膜，所述环形振膜中间形成中空区域，所述振动板连接于所述环形振膜的中空区域。
具体地，所述环形振膜的材料可以包括工程塑料、弹性体材料或者胶膜中的至少一种，工程塑料具体可以是PEEK(聚醚醚酮)或PAR(聚芳酯)，弹性体材料具体可以是TPU(热塑性聚氨酯弹性体橡胶)、TPEE(聚酯橡胶)或者硅橡胶，胶膜具体可以是丙烯酸酯类胶或者有机硅类胶。所述环形振膜的厚度在0.02mm-0.5mm的范围内，所述环形振膜与所述振动板之间可以通过胶粘剂或双面胶进行粘接，在保证所述环形振膜与所述振动板之 间连接便捷性的同时，提高所述环形振膜与所述振动板的连接强度。
虽然已经通过例子对本申请的一些特定实施例进行了详细说明，但是本领域的技术人员应该理解，以上例子仅是为了进行说明，而不是为了限制本申请的范围。本领域的技术人员应该理解，可在不脱离本申请的范围和精神的情况下，对以上实施例进行修改。本申请的范围由所附权利要求来限定。

Claims (11)

  1. 一种用于发声装置的振动板，其特征在于，包括芳纶薄膜；
    所述振动板为单层振动板，所述单层振动板采用所述芳纶薄膜制成；
    或者，所述振动板为复合振动板，所述复合振动板包括至少两层，所述的复合振动板中的至少一层包括所述芳纶薄膜。
  2. 根据权利要求1所述的振动板，其特征在于，单层所述芳纶薄膜的厚度范围为4μm-100μm。
  3. 根据权利要求1所述的振动板，其特征在于，所述芳纶薄膜的弯曲强度大于或等于200MPa。
  4. 根据权利要求1所述的振动板，其特征在于，所述芳纶薄膜的模量大于或等于8GPa。
  5. 根据权利要求1所述的振动板，其特征在于，所述芳纶薄膜的成型原料包括对位芳纶、间位芳纶和杂环芳香族聚酰胺中的至少一种。
  6. 根据权利要求1所述的振动板，其特征在于，所述芳纶薄膜的成型方式为挤压成型、注塑成型和流延成型中的一种。
  7. 根据权利要求1所述的振动板，其特征在于，所述振动板为平板结构或凸包结构。
  8. 根据权利要求7所述的振动板，其特征在于，所述振动板采用热压成型工艺制成，所述振动板的成型温度大于140℃。
  9. 根据权利要求7所述的振动板，其特征在于，所述振动板的厚度范围为4μm-500μm。
  10. 根据权利要求1所述的振动板，其特征在于，所述振动板包括两层外表层和设在两个所述外表层之间的中间层，所述外表层由所述芳纶薄膜制成，所述中间层为发泡材料层。
  11. 一种发声装置，其特征在于，包括振动系统和与所述振动系统相互配合的磁路系统，所述振动系统包括权利要求1-10任何一项所述的振动板。
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